#astroid-backtotop{
   display: none;
   line-height: 0;
   position: fixed;
   right: $backtotop-right;
   bottom: $backtotop-bottom;
   padding: $backtotop-padding;
   z-index: $backtotop-zindex;
   &.circle{
      border-radius: 100%;
   }
   &.rounded{
      border-radius: $backtotop-rounded-radius;
   }
   &.square{
      border-radius: 0;
   }
}